When Were Individual States Admitted to the U.S.?

The United States of America is currently made up of 50 states and they officially joined the union over a period of 172 years. Here are some interesting statistics about states admitted to the union:

• Most common day of the month to join the union: 1st of the month (5 states)
• Most common month for states to join the union: December (9 states)
• Least common month for states to join the union: September and October (one admission each)
• Only two states were admitted on exactly the same date: North and South Dakota (2 November 1889)
• Admission dates that coincide with U.S. holidays:
• Oregon and Arizona were admitted on Valentine's Day (14 February)
• Nevada was admitted on Halloween (31 October)
• Washington was admitted on Veteran's Day (11 November)
• Most admissions in one particular month: November 1889 (4 states)
• Year with the most admissions: 1788 (8 states)

Here are two charts representing the dates of states admitted to the United States. The first chart lists the states in order of admission date. In the second chart, the states are organized in alphabetical order.

Written by L. S. Wynn